btrfs: move and export can_overcommit
This is the first piece of moving the space reservation code to space-info.c Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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